CN117835166A

CN117835166A - Information transmission method, device and storage medium

Info

Publication number: CN117835166A
Application number: CN202211185597.2A
Authority: CN
Inventors: 李芸; 王胡成; 刘险峰
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2024-04-05

Abstract

The embodiment of the application provides an information transmission method, an information transmission device and a storage medium. The information transmission method is applied to SMF and comprises the following steps: selecting one PSA in the VN group as the target PSA; and sending a first message to the target PSA, wherein the first message comprises information for indicating the target PSA to perform signaling interaction with a DN server. According to the information transmission method, the information transmission device and the storage medium, the SMF indicates one PSA in the VN group to perform signaling interaction with the DN server to finish data forwarding from the DN server to the terminal, so that the signaling interaction rate is improved, the data volume of data transmission is reduced, and the resource waste is reduced.

Description

Information transmission method, device and storage medium

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to an information transmission method, an information transmission device, and a storage medium.

Background

In a satellite scenario, a Data Network (DN) Server (Server) on the ground needs to send Data to all terminal/User Equipments (UEs) in a Virtual Network (VN) group.

In the related art, one possible scheme is: the UE is required to actively initiate a process of joining the multicast group (such as IPTV technology), and after the UE completes the session establishment process, the UE is required to actively initiate a request of joining the multicast group again, which is complicated and redundant. Another possible solution is: on a per protocol data unit (Protocol Data Unit, PDU) session basis, the DN Server sends unicast data to each UE, causing redundancy in the transmission of data over the N6 interface.

Therefore, the above related technical solution may cause problems of flow redundancy and data transmission redundancy.

Disclosure of Invention

The embodiment of the application provides an information transmission method, an information transmission device and a storage medium, which are used for optimizing the technical problem of multicast data transmission on an N6 interface in the prior art.

In a first aspect, an embodiment of the present application provides an information transmission method, applied to SMF, including:

selecting one PSA in the VN group as the target PSA;

and sending a first message to the target PSA, wherein the first message comprises information for indicating the target PSA to perform signaling interaction with a DN server.

In some embodiments, the selecting one PSA of the VN group as the target PSA comprises:

selecting a PSA to which a first UE initiating a PDU session establishment request belongs in a VN group as a target PSA; or alternatively, the first and second heat exchangers may be,

selecting one PSA in the VN group as the target PSA based on the topology of the PSAs in the VN group; or alternatively, the first and second heat exchangers may be,

one PSA in the VN group is randomly selected as the target PSA.

In some embodiments, the method further comprises:

transmitting first indication information to one or more PSAs in the VN group; the first indication information is used for indicating to join the multicast tree.

In some embodiments, the method further comprises:

Transmitting first indication information to the target PSA; the first indication information is used for indicating to join the multicast tree.

In some embodiments, the method further comprises:

receiving policy information sent by PCF; the policy information is used to instruct the SMF to select one PSA in a VN group as a target PSA;

determining matching forwarding rule information based on the policy information;

and sending the matching forwarding rule information to the target PSA.

In some embodiments, where all PSAs in the VN group are on mobile entities, the matching forwarding rule information includes one or more of the following rules:

a first rule that the target PSA forwards received data to UEs within coverage, and other PSAs in the VN group than the target PSA;

and a second rule, wherein other PSAs except the target PSAs in the VN group forward the received data to the UE in the coverage area.

In some embodiments, where all PSAs in the VN group are on the surface, the matching forwarding rule information includes one or more of the following rules:

a first rule that the target PSA forwards received data to a corresponding S-UPF;

A second rule that the S-UPF corresponding to the target PSA forwards the received data to the UE in the coverage area, and S-UPFs corresponding to other PSAs in the VN group except the target PSA;

and thirdly, forwarding the received data to the UE in the coverage range by the S-UPF corresponding to other PSAs except the target PSAs in the VN group.

In a second aspect, an embodiment of the present application provides an information transmission method, applied to a target PSA, including:

receiving a first message sent by an SMF, wherein the first message comprises information for indicating the target PSA to perform signaling interaction with a DN server; the first message is sent after the SMF selects the target PSA from a plurality of PSAs in a VN group.

In some embodiments, the method further comprises:

receiving first indication information sent by the SMF; the first indication information is used for indicating to join the multicast tree.

In some embodiments, the method further comprises:

receiving the matching forwarding rule information sent by the SMF; the matching forwarding rule information is determined by the SMF based on policy information sent by the PCF.

In some embodiments, the method further comprises:

receiving data sent by a DN server;

forwarding the received data to UEs within coverage and other PSAs in the VN group other than the target PSA.

In some embodiments, the method further comprises:

Receiving data sent by a DN server;

and forwarding the received data to the corresponding S-UPF.

In a third aspect, embodiments of the present application provide an SMF comprising a memory, a transceiver, and a processor;

a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

selecting one PSA in the VN group as the target PSA;

one PSA in the VN group is randomly selected as the target PSA.

In some embodiments, the processor is further configured to read the computer program in the memory and perform the following:

and sending the matching forwarding rule information to the target PSA.

In a fourth aspect, embodiments of the present application provide a target PSA comprising a memory, a transceiver, and a processor;

receiving data sent by a DN server;

and forwarding the received data to the corresponding S-UPF.

In a fifth aspect, an embodiment of the present application provides an information transmission apparatus, including:

a first selection module for selecting one PSA in the VN group as a target PSA;

and the first sending module is used for sending a first message to the target PSA, wherein the first message contains information for indicating the target PSA to perform signaling interaction with the DN server.

In some embodiments, the first selection module is specifically configured to:

one PSA in the VN group is randomly selected as the target PSA.

In some embodiments, a second transmitting module is further included;

the second sending module is used for sending first indication information to one or more PSAs in the VN group; the first indication information is used for indicating to join the multicast tree.

In some embodiments, a third transmitting module is further included;

the third sending module is used for sending the first indication information to the target PSA; the first indication information is used for indicating to join the multicast tree.

In some embodiments, further comprising:

the first receiving module is used for receiving policy information sent by the PCF; the policy information is used to instruct the SMF to select one PSA in a VN group as a target PSA;

and the first determining module is used for determining the matching forwarding rule information based on the strategy information.

And the fourth sending module is used for sending the matching forwarding rule information to the target PSA.

In a sixth aspect, an embodiment of the present application provides an information transmission apparatus, including:

the second receiving module is used for receiving a first message sent by the SMF, wherein the first message contains information for indicating the target PSA and DN server to perform signaling interaction; the first message is sent after the SMF selects the target PSA from a plurality of PSAs in a VN group.

In some embodiments, a third receiving module is further included;

the third receiving module is used for receiving the first indication information sent by the SMF; the first indication information is used for indicating to join the multicast tree.

In some embodiments, a fourth receiving module is further included;

the fourth receiving module is used for receiving the matching forwarding rule information sent by the SMF; the matching forwarding rule information is determined by the SMF based on policy information sent by the PCF.

In some embodiments, a fifth receiving module and a fifth transmitting module are further included;

the fifth receiving module is used for receiving data sent by the DN server;

the fifth sending module is configured to forward the received data to the UE in the coverage area, and other PSAs in the VN group except the target PSA.

In some embodiments, the system further comprises a sixth receiving module and a sixth transmitting module;

the sixth receiving module is used for receiving data sent by the DN server;

the sixth sending module is configured to forward the received data to a corresponding S-UPF.

In a seventh aspect, embodiments of the present application further provide a processor-readable storage medium storing a computer program for causing a processor to execute the information transmission method according to the first aspect or the second aspect described above.

In an eighth aspect, embodiments of the present application further provide a computer-readable storage medium storing a computer program for causing a computer to execute the information transmission method according to the first aspect or the second aspect described above.

In a ninth aspect, embodiments of the present application further provide a communication device readable storage medium storing a computer program for causing a communication device to execute the information transmission method according to the first aspect or the second aspect described above.

In a tenth aspect, embodiments of the present application further provide a chip product readable storage medium storing a computer program for causing a chip product to execute the information transmission method according to the first aspect or the second aspect described above.

According to the information transmission method, the information transmission device and the storage medium, the SMF indicates one PSA in the VN group to perform signaling interaction with the DN server, so that the signaling interaction rate is improved, the data volume of data transmission is reduced, and the resource waste is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic flow chart of an information transmission method according to an embodiment of the present application;

fig. 2 is one of schematic diagrams of an exemplary scenario of an information transmission method provided in an embodiment of the present application;

fig. 3 is one of signaling interaction diagrams of an exemplary scenario of an information transmission method provided in an embodiment of the present application;

fig. 4 is a second schematic diagram of an exemplary scenario of an information transmission method provided in an embodiment of the present application;

fig. 5 is a second signaling interaction diagram of an exemplary scenario of an information transmission method provided in an embodiment of the present application;

FIG. 6 is a second flow chart of an information transmission method according to the embodiment of the present application;

fig. 7 is a schematic structural diagram of an SMF according to an embodiment of the present application;

FIG. 8 is a schematic diagram of the structure of a target PSA provided in an embodiment of the present application;

fig. 9 is a schematic structural diagram of an information transmission device according to an embodiment of the present application;

fig. 10 is a second schematic structural diagram of an information transmission device according to an embodiment of the present disclosure.

Detailed Description

In a satellite scenario, when the DN Server sends data to UEs in the VN group, unicast data may be sent to each UE based on the N6 connection established by the PDU session of each UE. Alternatively, network tv (Internet Protocol Television, IPTV) techniques may be used, after the PDU session is established, the session management function (Session Management Function, SMF) determines whether to allow the UE to join the multicast group according to an internet group management protocol (Internet Group Management Protocol, IGMP) or multicast snoop discovery protocol (Multicast Listener Discover, MLD) message sent by the UE user plane to the PDU session anchor (PDU Session Anchor, PSA), then the DN Server sends a piece of multicast data to each PSA joining the multicast group, and after the PSA receives the multicast data, identifies the multicast address information, copies and forwards the data to all UEs under the PSA according to the matching forwarding rules issued by the SMF in the PDU session. Under the condition that different UEs in a VN group are anchored on the same PSA, DN Server needs to send one data to each UE through an N6 interface, and one PSA receives multiple multicast data, namely multiple times of transmission of the multicast data on the N6 interface, so that resource waste is caused, and when the IPTV technology is used for data transmission, after the PDU session establishment process of the UE is required to be completed, the UE actively initiates a request for joining the multicast group again, the flow is complicated, and interactive redundancy is caused. In addition, under the condition that the UE in the VN group is anchored at the ground PSA, the communication process between different UEs has interactive redundancy between DN Server and the ground PSA, and resources are wasted.

Based on the technical problems, the embodiment of the application provides an information transmission method, when the UE establishes a PDU session, the SMF selects one PSA in a VN group as a target PSA, instructs the target PSA to perform signaling interaction with a DN Server, then forwards received data to the UE in a coverage area and other PSAs except the target PSA in the VN group through a matching forwarding rule issued by the SMF, and then the other PSAs continue to forward the data to the UE in the coverage area, thereby reducing transmission redundancy of multicast data on an N6 interface, realizing data interaction between the UEs anchored to the ground by establishing an N19 tunnel between user plane functions S-UPF on a mobile entity, simplifying an interaction process, and reducing resource waste.

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Fig. 1 is a schematic flow chart of an information transmission method according to an embodiment of the present application, and as shown in fig. 1, an embodiment of the present application provides an information transmission method, where an execution body may be SMF. The method comprises the following steps:

step 101, selecting one PSA in the VN group as the target PSA.

Specifically, in the present embodiment, the SMF first selects one PSA in the VN group as the target PSA.

One VN group may include a plurality of UEs, and different UEs may be anchored on different PSAs, or may be anchored on the same PSA, and an N19 tunnel that is interconnected between each PSA may be established by using the SMF, so as to implement data transmission between PSAs. The UE-anchored PSA may be on a mobile entity, which may alternatively be a non-terrestrial mobile entity, such as a satellite; the UE-anchored PSA may also be on the surface; the energy consumption, time delay, distance and the like of data transmission between each PSA and DN Server are different, and the embodiment can be flexibly applied to various scenes.

For example, there are three UEs in a VN group, UE1, UE2 and UE3, respectively, PSA1 is the PDU session anchor of UE1, PSA2 is the PDU session anchor of UE2 and UE3, and SMF may select PSA1 or PSA2 as the target PSA.

Step 102, a first message is sent to the target PSA, where the first message includes information for indicating the target PSA to perform signaling interaction with the DN Server.

Specifically, in the embodiment of the application, after the SMF selects one PSA in the VN group as the target PSA, a first message is sent to the target PSA, where the first message includes information for indicating that the target PSA performs signaling interaction with the DN Server. Alternatively, the DN may be the Internet, or an IP multimedia subsystem (IP Multimedia Subsystem, IMS) or a dedicated data network.

For example, UE1 is anchored to PSA1, UE2 and UE3 are anchored to PSA2, and after the SMF selects PSA1 as the target PSA, a message including information indicating that PSA1 performs signaling interaction with DN Server is transmitted to PSA1, and PSA1 receives the message.

According to the information transmission method provided by the embodiment of the application, one PSA is selected from the VN group to serve as the target PSA, and the message containing the information indicating the signaling interaction between the target PSA and the DN Server is sent to the target PSA, so that repeated transmission of multicast data on an N6 interface is reduced, signaling interaction rate is improved, and resource waste is reduced.

In some embodiments, the selecting one PSA of the VN group as the target PSA comprises: selecting a PSA to which a first UE initiating a PDU session establishment request belongs in a VN group as a target PSA; or, based on the topology of the PSAs in the VN group, selecting one PSA in the VN group as the target PSA; or, one PSA in the VN group is randomly selected as the target PSA.

For example, in a VN group, during PDU session establishment of UE1, if anchor PSA1 of the current PDU session is the first anchor selected by the VN group, PSA1 may be selected as the target PSA.

For another example, in one VN group, UE1 is anchored to PSA1, UE2 is anchored to PSA2, and UE3 is anchored to PSA3. At a certain moment, the distance between the PSA3 and the access node is smaller than the distance between the PSA1 and the access node and the distance between the PSA2 and the access node, and the SMF can select the PSA3 as a target PSA, so that time delay is reduced, and signaling interaction efficiency is improved.

For another example, there are multiple PDU session anchors PSA1, PSA2, and PSA3 in one VN group, and any one of the PDU session anchors PSA1 or PSA2 or PSA3 may be selected as the target PSA.

For another example, there are multiple PDU session anchors PSA1, PSA2 and PSA3 in a VN group, the SMF selects PSA1 in the VN group as the target PSA, based on topology, the power consumption of data transmission between PSA1 and DN Server is greater than that of data transmission between other PSA and DN Server, or the time delay of data transmission between PSA1 and DN Server is greater than that between other PSA and DN Server, or based on the influence of other factors related to data transmission of topology, the PSA currently performing signaling interaction with DN Server is replaced, and a more suitable PSA is selected as the target PSA to perform signaling interaction with DN Server, thereby improving signaling interaction efficiency.

In some embodiments, the method further comprises: transmitting first indication information to one or more PSAs in the VN group; the first indication information is used for indicating to join the multicast tree.

Specifically, by sending the first indication information to one or more PSAs in the VN group, the one or more PSAs are enabled to join the multicast tree based on this first indication information. The flow of adding the PSA into the multicast tree is simplified, and the signaling interaction efficiency is improved. Alternatively, the first indication information may be independent multicast protocol (Protocol Independent Multicast, PIM) signaling.

The PSA added into the multicast tree can receive multicast data, when a plurality of PSAs are added into the multicast tree, the DN Server does not need to copy a plurality of data to be sent respectively, but only needs to send one part, and then the PSA receiving the part of data forwards or copies the data according to actual demand, thereby reducing repeated sending of the multicast data of the N6 interface, improving data interaction efficiency, reducing data transmission quantity and further reducing resource waste.

For example, the SMF sends first indication information to PSA1 in the VN group, and after receiving the information, PSA1 joins the multicast tree based on the first indication information, so that the PSA1 can receive data issued by the DN Server. When a plurality of UEs are anchored on the PSA1, the DN Server only needs to send one piece of data to the PSA1, and does not need to send multiple pieces of data according to the session number of the UEs.

For another example, if the SMF sends the first indication information to PSA1, PSA2, and PSA3 in the VN group, and PSA1, PSA2, and PSA3 join the multicast tree based on the first indication information, then each of PSA1, PSA2, and PSA3 has a condition for signaling interaction with the DN Server.

Further, the SMF may send a matching forwarding rule of the newly added multicast data to the PSA, perform signaling interaction with the DN Server through the designated PSA according to the rule, and forward the data received from the DN Server to other PSAs by the PSA, so as to further reduce transmission redundancy of the multicast data issued by the DN Server.

In some embodiments, the method further comprises: transmitting first indication information to the target PSA; the first indication information is used for indicating to join the multicast tree.

Specifically, after selecting a target PSA, the SMF sends first indication information to the target PSA, indicating that the target PSA joins the multicast tree. And after receiving the first indication information, the target PSA joins the multicast tree according to the indication. Alternatively, the first indication information may be independent multicast protocol (Protocol Independent Multicast, PIM) signaling.

In some embodiments, the method further comprises: receiving policy information sent by a policy control function (Policy Control Function, PCF); the policy information is used to instruct the SMF to select one PSA in a VN group as a target PSA; determining matching forwarding rule information based on the policy information; and sending the matching forwarding rule information to the target PSA.

Specifically, the SMF receives policy information from the PCF, selects one PSA in the VN group as a target PSA based on the policy information, determines matching forwarding rule information based on the policy information, and sends the matching forwarding rule to the target PSA, which receives the matching forwarding rule, and forwards data received from the DN Server according to the matching forwarding rule.

For example, a plurality of session anchors are arranged in a VN group to different PSAs, the SMF selects the PSA1 as a target PSA based on policy information sent by the PCF, and sends first indication information to the target PSA, so that the target PSA and the DN Server perform signaling interaction for joining a multicast tree, such as PIM signaling, so that the target PSA joins the multicast tree, and the issuing of multicast data of the DN Server is realized through the target PSA.

Further, the SMF may send a matching forwarding rule of the newly added multicast data to the target PSA, the target PSA receives the matching forwarding rule, and according to the rule, performs signaling interaction with the DN Server through the target PSA, and the target PSA forwards the data received from the DN Server to other PSAs not added to the multicast tree in the VN group, thereby reducing transmission redundancy of the multicast data issued by the DN Server and reducing resource waste.

Alternatively, the mobile entity may be a non-terrestrial mobile entity or other mobile entity that enables the UE to be anchored, such as a satellite being one type of mobile entity.

For example, there are five UEs in a VN group, each of which is on a mobile entity, e.g. each on a satellite, including PSA1, PSA2 and PSA3, where UE1 and UE2 are anchored to PSA1, UE3 and UE4 are anchored to PSA2, UE5 is anchored to PSA3, and SMF selects PSA1 as the target PSA.

According to the first rule in the matching forwarding rule information, after receiving data sent by the DN Server, the PSA1 forwards the received data to the UE1 and the UE2 in the coverage area, and the PSA1 forwards the received data to the PSA2 and the PSA3.

Alternatively, the second rule received by PSA2 and PSA3 may be PSA1 transmitted or SMF transmitted.

According to the second rule in the matching forwarding rule information, PSA2 forwards data received from PSA1 to UE3 and UE4, and PSA3 forwards data received from PSA1 to UE5.

For example, there are five UEs in a VN group, each of which is on the ground, including PSA1, PSA2, and PSA3, with UE1 and UE2 anchored to PSA1, UE3 and UE4 anchored to PSA2, UE5 anchored to PSA3, and SMF selects PSA1 as the target PSA.

According to the first rule in the matched forwarding rule information, PSA1 receives data sent by DN Server, and then PSA1 forwards the received data to S-UPF1 corresponding to PSA 1.

According to the second rule in the matching forwarding rule information, the S-UPF1 corresponding to the PSA1 forwards the received data to the UE1 and the UE2 in the coverage range, and the S-UPF1 forwards the received data to the S-UPF2 corresponding to the PSA2 and the S-UPF3 corresponding to the PSA 3.

Alternatively, the third rule received by PSA2 and PSA3 may be PSA1 transmitted or SMF transmitted.

And according to a third rule in the matched forwarding rule information, the S-UPF2 corresponding to the PSA2 forwards the received data to the UE3 and the UE4, and the S-UPF3 corresponding to the PSA3 forwards the received data to the UE5.

Under the condition that the UE in the VN group is anchored at the ground PSA, the data forwarding is carried out through the N19 tunnel between the ground PSA and the N19 tunnel between the target PSA and other PSAs without establishing the N19 tunnel between the target PSA and other PSAs; the method establishes an N19 tunnel between the S-UPFs corresponding to the PSA, and issues a UE-to-UE matching forwarding rule to each S-UPF, so that forwarding of data between the UEs is performed on a mobile entity, signaling interaction is reduced, and data transmission efficiency between the UEs is enhanced.

The information transmission method provided in the above embodiments is further described below by way of specific examples:

example 1:

fig. 2 is a schematic diagram of an example scenario of an information transmission method provided in an embodiment of the present application, as shown in fig. 2, one VN group has three UEs, namely UE1, UE2 and UE3, where PDU session anchors of the three UEs are all located on the satellite, where S-gNB1 and S-PSA1 are deployed on satellite 1, S-gNB2 and S-PSA2 are deployed on satellite 2, UE1 and UE2 are anchored to S-PSA1, and UE3 is anchored to S-PSA2, and DN Server issues data to S-PSA 1. Fig. 3 is one of signaling interaction diagrams of an exemplary scenario of an information transmission method provided in an embodiment of the present application. Fig. 3 is a process of setting up a user plane path in the above scenario. Specifically, in the above scenario, the process of implementing data forwarding from DN Server to UE is as follows:

Step 1: UE1 initiates PDU session establishment request to the core network through satellite base station S-gNB 1.

Step 2: upon receiving the PDU Session establishment request message from the satellite, the terrestrial access and mobility management function (Access and Mobility Management Function, AMF) performs SMF selection, while the AMF stores single network slice selection assistance information (Single Network Slice Selection Assistance Information, S-NSSAI), data network name (Data Network Name, DNN), PDU Session identifier (PDU Session ID), and PDU Session access type association.

Step 3: the AMF calls nsmf_pduse_ CreateSMContext Request signaling to the SMF requesting that the SMF establish a session management (Session Management, SM) context for the session.

Step 4: the SMF obtains session management subscription data from unified data management (Unified Data Management, UDM) and subscribes to data modification notifications.

Step 5: the SMF responds to the request of step 3, replying to the response of creating or updating the session context accordingly.

Step 6: an optional secondary authentication or authorization is performed on the initial request.

Step 7a: the SMF executes a corresponding PCF selection procedure according to whether dynamic policy control and charging (Policy Control andCharging, PCC) is deployed, or whether PCF ID is carried in step 3, etc.

Step 7b: SM policy association establishment or modification is performed with the selected PCF based on the request type. After the SM policy association is established with the PCF, the default PCC rules of the PDU session are obtained.

Step 8: the SMF selects a PSA user plane function (User Plane Function, UPF) and selects a satellite user plane function (S-UPF) corresponding to the satellite where the S-gNB1 is located as the PSA, namely S-PSA1. The SMF determines that S-PSA1 is the first PDU Session establishment request in the VN group corresponding to (DNN, S-NSSAI) in the current UE Session.

Step 9: the SMF sends an N4 session establishment request to the S-PSA1, sends a forwarding rule of multicast data to the S-PSA1, acquires anchor point PSA of UE needing to instruct all PDU sessions of which the VN group corresponds to DNN and S-NSSAI to be established in the VN group to be added into a multicast tree summarized by taking DN Server as a root node based on subscription data or strategy information, and then instructs the S-PSA1 to perform signaling interaction of joining the multicast group, such as PIM signaling, with the DN Server, and joins the multicast tree of the VN group.

The matching forwarding rule issued by the SMF to the S-PSA1 is as follows:

when the S-PSA1 receives the multicast data sent by the DN Server, the data is forwarded to the UE1.

Step 10: after receiving the message in step 9, the S-PSA1 exchanges signaling with the DN Server, such as PIM signaling, to add the signaling to the multicast tree with the DN Server as the root node, where the function of the S-PSA1 is equivalent to a multicast router.

Step 11: an N3 tunnel between the S-gNB and the S-PSA1 is established.

Step 12: the on-board S-gNB performs exchange of specific signaling with the UE, radio resource control (Radio Resource Control, RRC) connection reconfiguration and configuration completion, etc.

Step 13: the S-gNB sends an N2 PDU session response to the AMF.

Step 14: if an N2 session management (Session Management, SM) message is included in step 10, the AMF sends a session context update request to the SMF, while the AMF forwards the N2 SM information received from the on-board S-gNB to the SMF, which responds to the AMF.

Step 15: alternatively, if the PDU session establishment is unsuccessful, the AMF is notified to release the session-related content, including the N4 session, PDU session address, and association with the PCF, etc.

Step 16: UE2 initiates a PDU Session establishment procedure, as in steps 1 to 7b.

Step 17: the SMF proceeds to select S-PSA1 for the PDU session. At this point the SMF determines that the UE2 is not the first UE anchored to the S-PSA1 for the VN group. According to the judgment result, the SMF does not instruct the S-PSA1 and DN Server to perform signaling interaction for joining the multicast group, such as PIM signaling to join the multicast tree.

Step 18: the SMF issues an N4 establishment request of the UE2 PDU session to the S-PSA1, and adds the following rules on the basis of the existing rules:

When the S-PSA1 receives the multicast data sent by the DN Server, it inquires the number of UEs of the VN group anchored on the S-PSA1, and copies and forwards the number (or SMF instructs the S-PSA1 to copy the received data and forwards the data to UE1 and UE2, respectively).

Step 19: the UE2 performs the remaining PDU session establishment steps, the same procedure as steps 11 to 15.

Step 20: the UE3 initiates a PDU session establishment request, anchors to the S-PSA2, and performs the same procedure as steps 1 to 15. The SMF judges that the session is established as the session of the first VN group on the S-PSA2, and notifies the S-PSA2 to join a multicast tree taking DN Server as a root node.

Step 21: the SMF determines that the VN group is more than one PSA and initiates an N19 tunnel establishment procedure between S-PSA1 and S-PSA 2.

In the PDU session establishment process, by judging whether the anchor point PSA of the current PDU session is the first anchor point selected by the VN group, if so, the SMF issues a message indicating that the anchor point PSA performs signaling interaction with the DN Server to the PSA so as to enable the PSA to be added into a multicast tree taking the DN Server as a root node, and issues a matching forwarding rule to the PSA, namely, copies and forwards the multicast data to the UE according to the number of the UEs of the same VN group under the PSA. Therefore, repeated transmission of multicast data on the N6 interface is reduced, and resource waste is reduced.

Example 2:

in example 1, multiple PSAs in the VN group are all added to the multicast tree with DN Server as the root node. Whereas in this example only one of the PSAs is selected to join the multicast tree. When DN Server wants to send multicast data to UE in VN group, it forwards the multicast data to the PSA through the unique N6 multicast path, and after receiving multicast data of DN Server, it copies and forwards the multicast data to UE in coverage area and other PSA of same VN group, so as to forward to all UE in VN group. In the scenario of this example, the process of implementing data forwarding from DN Server to UE is as follows:

Step 2: after receiving the PDU Session establishment request message of the satellite, the terrestrial AMF performs SMF selection, and meanwhile, the AMF stores the S-NSSAI, DNN, PDU Session ID and the association of the PDU Session access type.

Step 3: the AMF calls Nsmf_PDUSion_ CreateSMContext Request signaling to the SMF requesting that the SMF establish the SM context for the session.

Step 4: the SMF obtains session management subscription data from the UDM and subscribes to the data modification notification.

Step 7a: the SMF executes a corresponding PCF selection procedure according to whether dynamic PCC is deployed or whether PCF ID is carried in step 3, etc.

Step 8: the SMF selects the PSA UPF, and selects the satellite user plane function (S-UPF 1) corresponding to the satellite where the S-gNB1 is located as the PSA, namely S-PSA1. The SMF determines that this PSA is the first PDU Session establishment request in the VN group corresponding to (DNN, S-nsai) in the current UE Session.

Step 9: the SMF sends an N4 session establishment request to the S-PSA1, sends a forwarding rule of multicast data to the S-PSA1, acquires anchor point PSA of UE which needs to instruct all PDU sessions of which the VN group corresponds to DNN and S-NSSAI in the VN group to be added into a multicast tree summarized by taking DN Server as a root node based on subscription data or strategy information, and then instructs the S-PSA1 and DN Server to perform signaling interaction for joining the multicast group, such as PIM signaling, and joins the multicast tree of the VN group.

The matching forwarding rule issued by the SMF to the S-PSA1 is as follows:

Step 11: an N3 tunnel between the S-gNB and the S-PSA1 is established.

Step 12: the on-board S-gNB performs exchanges of specific signaling with the UE, such as RRC connection reconfiguration and configuration completion, etc.

Step 13: the S-gNB sends an N2 PDU session response to the AMF.

Step 14: if the N2 SM message is included in step 10, the AMF sends a session context update request to the SMF, while the AMF forwards the N2 SM information received from the on-board S-gNB to the SMF, which responds to the AMF.

when the S-PSA1 receives the multicast data sent by the DN Server, it inquires the number of UEs of the VN group anchored on the PSA, and copies and forwards the number (or SMF instructs the PSA to copy the received data and forwards the data to UE1 and UE2, respectively).

Step 20: when the UE3 establishes a PDU session, the SMF selects S-PSA2 as an anchor point of the session, and determines that S-PSA1 in the VN group has been added to the multicast tree with DN Server as a root node, then the SMF no longer instructs S-PSA2 to perform signaling interaction with DN Server to join the multicast group, such as PIM signaling. Adding the following matching forwarding rules:

when the S-PSA2 receives the multicast data from the N19 tunnel, the multicast data is duplicated into corresponding data packets according to the number of the UEs of the VN group under the S-PSA2, and the data packets are forwarded to each UE through the tunnel of each UE PDU session.

Step 21: the SMF determines that the VN group is more than one PSA and initiates an N19 tunnel establishment procedure between S-PSA1 and S-PSA 2. After having multiple session anchors with the VN group to different PSAs, the SMF may also change the PSA that is uniquely added to the multicast tree with DN Server as the root node based on topology.

Step 22: the SMF sends an N4 Modification (Modification) request to the S-PSA1, modifying the forwarding rules of the multicast data it receives to the PSA 1:

after receiving the multicast data of DN Server, determining the number of the copied data messages according to the sum of the number of N19 tunnels with other PSA (here PSA 1) and the number of UE of the VN group under the S-PSA1, and forwarding the copied data messages to each destination UE through the N19 tunnels and the tunnels of PDU session anchored to the S-PSA 1.

In the PDU session establishment process, a message indicating that the PSA performs signaling interaction with DN Server is issued to one PSA so that the PSA is added into a multicast tree taking DN Server as a root node, and a matching forwarding rule is issued to the PSA, the PSA forwards received data to UE under the PSA and other PSAs connected with the PSA through an N19 tunnel, and a new target PSA can be replaced from a plurality of PSAs in a VN group based on topology, thereby achieving the purposes of reducing data interaction, energy consumption and resource waste.

Example 3:

fig. 4 is a second schematic diagram of an exemplary scenario of an information transmission method according to an embodiment of the present application. As shown in fig. 4, a VN group has three UEs, UE1, UE2 and UE3, respectively, where PDU session anchors of the three UEs are all located on the ground, S-gNB1 and S-UPF1 are deployed on satellite 1, S-gNB2 and S-UPF2 are deployed on satellite 2, where UE1 and UE2 are anchored at PSA1, and UE3 is anchored at PSA2, and DN Server issues data to PSA 1. Fig. 5 is a second signaling interaction diagram of an exemplary scenario of an information transmission method provided in an embodiment of the present application, and fig. 5 is a process of establishing a user plane path in the above scenario. Specifically, in the above scenario, the process of implementing data forwarding from DN Server to UE is as follows:

Step 8: the SMF selects the PSA UPF, and selects the S-UPF1 corresponding to the S-gNB1 as the PSA, namely the PSA1. The SMF determines that this PSA is the first PDU Session establishment request in the VN group corresponding to (DNN, S-nsai) in the current UE Session.

Step 9a: the SMF sends an N4 session establishment request to the PSA1, sends a matching forwarding rule of multicast data to the PSA1, obtains that the ground PSA of the UE needing to instruct all PDU sessions of which the VN group corresponds to DNN and S-NSSAI are established in the VN group is added into a multicast tree summary taking a DN Server as a root node based on subscription data or policy information, and then instructs the PSA1 and the DN Server to perform signaling interaction for joining the multicast group, such as PIM signaling, and joins the multicast tree of the VN group. Alternatively, the terrestrial PSA may also determine, based on the configuration, that it is necessary to initiate joining the terrestrial PSA in the multicast tree with the DN Server as the root node.

The matching forwarding rules issued by SMF to PSA1 are as follows:

when the PSA1 receives the multicast data sent by the DN Server, the data is forwarded to the UE1.

Step 9b: an N9 tunnel between the S-UPF and the surface PSA1 is established according to the prior art.

Step 10: after receiving the message in step 9a, PSA1 exchanges signaling, such as PIM signaling, with the DN Server to add to the multicast tree with the DN Server as the root node, where the function of PSA1 corresponds to a multicast router.

Step 11: an N3 tunnel between the S-gNB and PSA1 is established.

Step 13: the S-gNB sends an N2 PDU session response to the AMF.

Step 14: if the N2 SM message is included in step 10, the AMF sends a session context update request to the SMF, while the AMF forwards the N2 SM information received from the on-board S-gNB1 to the SMF, which responds to the AMF.

Step 17: the SMF proceeds to select PSA1 for the PDU session. At this point the SMF determines that the UE2 is not the first UE anchored to the PSA1 for the VN group. According to the judgment result, the SMF does not instruct the PSA1 to perform signaling interaction with the DN Server to join the multicast group, such as PIM signaling to join the multicast tree.

Step 18: the SMF issues an N4 establishment request of the UE2 PDU session to the PSA1, and adds the following rules on the basis of the existing rules:

when PSA1 receives multicast data sent by DN Server, it inquires the number of UEs of the VN group anchored on the PSA, and copies and forwards the number (or SMF instructs PSA to copy the received data and forwards it to UE1 and UE2, respectively).

Step 19: an N9 tunnel for the UE2 session is established according to the prior art. The UE2 then performs the remaining PDU session establishment steps, the same procedure as steps 11 to 15.

Step 20: UE3 initiates a PDU session establishment request, anchors to PSA2, and performs the same procedure as steps 1 to 15. The SMF determines that the session is the session establishment of the first VN group on PSA2, and notifies PSA2 to join the multicast tree with DN Server as the root node.

Step 21: the SMF judges that UE1, UE2 and UE3 respectively pass through two S-UPFs (namely S-UPF1 and S-UPF 2) on the satellite, establishes an N19 tunnel between the S-UPFs through an N4 modification process, and adds the following issuing rules to the S-UPFs 1 and 2:

when the S-UPF1 receives the data with the destination address of the UE3, the data is forwarded to the S-UPF2 through an N19 tunnel between the S-UPFs;

when the S-UPF2 receives the data with the destination address of the UE1, the data is forwarded to the S-UPF1 through an N19 tunnel between the S-UPFs.

In the PDU session establishment process, the PSA in the VN group sends a message indicating that the PSA and the DN Server perform signaling interaction, so that the PSA is added into a multicast tree taking the DN Server as a root node, and sends a matching forwarding rule to the PSA, the PSA forwards received data to the corresponding S-UPF, and an N19 tunnel between the S-UPF forwards the data, thereby reducing data transmission redundancy between the satellite and the earth and enhancing data transmission efficiency between the UE.

Example 4:

in contrast to example 3, in this example only one of the terrestrial PSAs is selected to join the multicast tree. When DN Server wants to send multicast data to UE in VN group, it forwards the multicast data to the PSA through the unique N6 multicast path, and after receiving multicast data of DN Server, it copies and forwards the multicast data to UE in coverage area and other PSA of same VN group, so as to forward to all UE in the VN group. In the scenario of this example, the process of implementing data forwarding from DN Server to UE is as follows:

Step 8: the SMF selects the PSA UPF, and selects the satellite user plane function S-UPF1 corresponding to the satellite where the S-gNB1 is located as the PSA, namely the PSA1. The SMF determines that this PSA is the first PDU Session establishment request in the VN group corresponding to (DNN, S-nsai) in the current UE Session.

Step 9a: the SMF sends an N4 session establishment request to the PSA1, sends a forwarding rule of multicast data to the PSA1, acquires anchor PSA of UE needing to instruct all PDU sessions of which the VN group corresponds to DNN and S-NSSAI to be established in the VN group to be added into a multicast tree summary taking DN Server as a root node based on subscription data or policy information, and then instructs the PSA1 and the DN Server to perform signaling interaction for joining the multicast group, such as PIM signaling, and joins the multicast tree of the VN group. Alternatively, the terrestrial PSA may also determine, based on the configuration, that it is necessary to initiate joining the terrestrial PSA in the multicast tree with the DN Server as the root node.

The matching forwarding rules issued by SMF to PSA1 are as follows:

Step 9b: an N9 tunnel between S-UPF1 and the surface PSA1 is established according to the prior art.

Step 11: an N3 tunnel between the S-gNB and the surface PSA1 is established.

Step 13: the S-gNB sends an N2 PDU session response to the AMF.

Step 20: when the UE3 establishes a PDU session, the SMF selects PSA2 as an anchor point of the session, and determines that PSA1 in the VN group has been added to the multicast tree with DN Server as a root node, then the SMF no longer instructs PSA2 to perform signaling interaction with DN Server to join the multicast group, such as PIM signaling. Adding the following matching forwarding rules:

when the PSA2 receives the multicast data from the N19 tunnel, the multicast data is duplicated into corresponding data packets according to the number of the UEs of the VN group under the PSA2, and the data packets are forwarded to each UE through the tunnel of each UE PDU session.

In the PDU session establishment process, a message indicating that the PSA in the VN group performs signaling interaction with the DN Server is issued, so that the PSA is added into a multicast tree taking the DN Server as a root node, and a matching forwarding rule is issued to the PSA, the PSA forwards received data to the corresponding S-UPF, an N19 tunnel between ground PSAs is not established any more, an N19 tunnel between S-UPFs is established, and the data is forwarded through the N19 tunnel between S-UPFs, thereby reducing data transmission redundancy between satellite and earth, reducing resource waste and enhancing data transmission efficiency between UE.

Fig. 6 is a second flowchart of an information transmission method according to an embodiment of the present application, as shown in fig. 6, where an execution body of the information transmission method may be a target PSA, including:

step 601, receiving a first message sent by an SMF, where the first message includes information for indicating signaling interaction between the target PSA and a DN server; the first message is sent after the SMF selects the target PSA from a plurality of PSAs in a VN group.

In some embodiments, the method further comprises:

receiving data sent by a DN server;

In some embodiments, the method further comprises:

receiving data sent by a DN server;

and forwarding the received data to the corresponding S-UPF.

Specifically, the information transmission method provided in the embodiments of the present application may refer to the embodiment of the information transmission method in which the execution body is an SMF, and may achieve the same technical effects, and the parts and beneficial effects that are the same as those of the corresponding method embodiment in the embodiments are not described in detail herein.

Fig. 7 is a schematic structural diagram of an SMF according to an embodiment of the present application, as shown in fig. 7, where the SMF includes a memory 720, a transceiver 700, and a processor 710, where:

a memory 720 for storing a computer program; a transceiver 700 for transceiving data under the control of the processor 710; a processor 710 for reading the computer program in the memory 720 and performing the following operations:

Selecting one PSA in the VN group as the target PSA;

Specifically, the transceiver 700 is used for receiving and transmitting data under the control of the processor 710.

Wherein in fig. 7, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 710 and various circuits of memory represented by memory 720, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 700 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The processor 710 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 710 in performing operations.

In some embodiments, processor 710 may be a central processing unit (Central Processing Unit, CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), which may also employ a multi-core architecture.

one PSA in the VN group is randomly selected as the target PSA.

and sending the matching forwarding rule information to the target PSA.

It should be noted that, the SMF provided in this embodiment of the present application may implement all the method steps implemented by the method embodiment in which the execution body is an SMF, and may achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are omitted herein.

Fig. 8 is a schematic structural diagram of a target PSA according to an embodiment of the present application, as shown in fig. 8, where the target PSA includes a memory 820, a transceiver 800, and a processor 810, where:

a memory 820 for storing a computer program; a transceiver 800 for transceiving data under the control of the processor 810; a processor 810 for reading the computer program in the memory 820 and performing the following operations:

Specifically, the transceiver 800 is configured to receive and transmit data under the control of the processor 810.

Wherein in fig. 8, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 810 and various circuits of memory represented by memory 820, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 800 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The processor 810 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 810 in performing operations.

The processor 810 may be a central processing unit (Central Processing Unit, CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA), or a complex programmable logic device (Complex Programmable Logic Device, CPLD), or may employ a multi-core architecture.

receiving data sent by a DN server;

and forwarding the received data to the corresponding S-UPF.

It should be noted that, the target PSA provided in this embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution body is the target PSA, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are omitted.

Fig. 9 is one of schematic structural diagrams of an information transmission device provided in the embodiment of the present application, as shown in fig. 9, the embodiment of the present application provides an information transmission device, including a first selection module 901 and a first sending module 902, where:

the first selection module 901 is configured to select one PSA in the VN group as a target PSA; the first sending module 902 is configured to send a first message to the target PSA, where the first message includes information for indicating that the target PSA performs signaling interaction with a DN server.

In some embodiments, the first selection module is specifically configured to:

one PSA in the VN group is randomly selected as the target PSA.

In some embodiments, a second transmitting module is further included;

In some embodiments, a third transmitting module is further included;

In some embodiments, further comprising:

Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution body is an SMF, and can achieve the same technical effects, and the same parts and beneficial effects as those of the method embodiment in the embodiment are not described in detail herein.

Fig. 10 is a second schematic structural diagram of an information transmission device according to an embodiment of the present application, as shown in fig. 10, where the information transmission device includes a first receiving module 1001.

The second receiving module 1001 is configured to receive a first message sent by an SMF, where the first message includes information for indicating that the target PSA performs signaling interaction with a DN server; the first message is sent after the SMF selects the target PSA from a plurality of PSAs in a VN group.

In some embodiments, a third receiving module is further included;

In some embodiments, a fourth receiving module is further included;

the fifth receiving module is used for receiving data sent by the DN server;

the sixth receiving module is used for receiving data sent by the DN server;

Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution body is the target PSA, and can achieve the same technical effects, and the same parts and beneficial effects as those of the method embodiment in the embodiment are not described in detail herein.

It should be noted that the division of the units/modules in the embodiments of the present application is merely a logic function division, and other division manners may be implemented in practice. In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

In some embodiments, there is also provided a computer-readable storage medium storing a computer program for causing a computer to execute the information transmission method provided by the above-described method embodiments.

Specifically, the computer readable storage medium provided in the embodiment of the present application can implement all the method steps implemented by the embodiments of the present application and achieve the same technical effects, and the parts and beneficial effects that are the same as those of the embodiments of the present application are not described in detail herein.

It should be noted that: the computer readable storage medium may be any available medium or data storage device that can be accessed by a processor including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CD, DVD, BD, HVD, etc.), and semiconductor memory (e.g., ROM, EPROM, EEPROM, nonvolatile memory (NAND FLASH), solid State Disk (SSD)), etc.

In addition, it should be noted that: the terms "first," "second," and the like in the embodiments of the present application are used for distinguishing between similar objects and not for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the terms "first" and "second" are generally intended to be used in a generic sense and not to limit the number of objects, for example, the first object may be one or more.

In the embodiment of the application, the term "and/or" describes the association relationship of the association objects, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The term "plurality" in the embodiments of the present application means two or more, and other adjectives are similar thereto.

The technical scheme provided by the embodiment of the application can be suitable for various systems, in particular to a 5G system. For example, suitable systems may be global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (general packet Radio service, GPRS), long term evolution (long term evolution, LTE), LTE frequency division duplex (frequency division duplex, FDD), LTE time division duplex (time division duplex, TDD), long term evolution-advanced (long term evolution advanced, LTE-a), universal mobile system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX), 5G New air interface (New Radio, NR), and the like. Terminal devices and network devices are included in these various systems. Core network parts such as evolved packet system (Evloved Packet System, EPS), 5G system (5 GS) etc. may also be included in the system.

The terminal device according to the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem, etc. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDAs), and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and the embodiments of the present application are not limited.

The network device according to the embodiment of the present application may be a base station, where the base station may include a plurality of cells for providing services for a terminal. A base station may also be called an access point or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or other names, depending on the particular application. The network device may be operable to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in a global system for mobile communications (Global System for Mobile communications, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a network device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), a home evolved base station (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like. In some network structures, the network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, which may also be geographically separated.

The term "determining B based on a" in the present application means that a is a factor to be considered in determining B. Not limited to "B can be determined based on A alone", it should also include: "B based on A and C", "B based on A, C and E", "C based on A, further B based on C", etc. Additionally, a may be included as a condition for determining B, for example, "when a satisfies a first condition, B is determined using a first method"; for another example, "when a satisfies the second condition, B" is determined, etc.; for another example, "when a satisfies the third condition, B" is determined based on the first parameter, and the like. Of course, a may be a condition in which a is a factor for determining B, for example, "when a satisfies the first condition, C is determined using the first method, and B is further determined based on C", or the like.

Multiple-input Multiple-output (Multi Input Multi Output, MIMO) transmissions may each be made between a network device and a terminal device using one or more antennas, and the MIMO transmissions may be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of the root antenna combinations.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. An information transmission method, applied to a session management function SMF, comprising:

selecting one protocol data unit session anchor PSA in the virtual network VN group as a target PSA;

and sending a first message to the target PSA, wherein the first message comprises information for indicating the target PSA to perform signaling interaction with a data network DN server.

2. The information transmission method according to claim 1, characterized in that the selecting one PSA of the VN group as the target PSA includes:

one PSA in the VN group is randomly selected as the target PSA.

3. The information transmission method according to claim 1, characterized in that the method further comprises:

4. The information transmission method according to claim 1, characterized in that the method further comprises:

5. The information transmission method according to claim 1, characterized in that the method further comprises:

receiving policy information sent by a policy control function PCF; the policy information is used to instruct the SMF to select one PSA in a VN group as a target PSA;

and sending the matching forwarding rule information to the target PSA.

6. The information transmission method according to claim 5, wherein in case that all PSAs in the VN group are on a mobile entity, the matching forwarding rule information includes one or more of the following rules:

and a second rule, forwarding the received data to the terminal UE in the coverage area by other PSAs except the target PSAs in the VN group.

7. The information transmission method according to claim 5, wherein in a case where all PSAs in the VN group are on the ground, the matching forwarding rule information includes one or more of the following rules:

the target PSA forwards the received data to a corresponding user plane function S-UPF on the mobile entity;

8. An information transmission method, applied to a target PSA, comprising:

9. The information transmission method according to claim 8, characterized in that the method further comprises:

10. The information transmission method according to claim 8, characterized in that the method further comprises:

11. The information transmission method according to claim 10, wherein in case that all PSAs in the VN group are on a mobile entity, the matching forwarding rule information includes one or more of the following rules:

12. The information transmission method according to claim 11, characterized in that the method further comprises:

receiving data sent by a DN server;

13. The information transmission method according to claim 10, wherein in a case where all PSAs in the VN group are on the ground, the matching forwarding rule information includes one or more of the following rules:

14. The information transmission method according to claim 13, characterized in that the method further comprises:

receiving data sent by a DN server;

and forwarding the received data to the corresponding S-UPF.

15. An SMF comprising a memory, a transceiver, and a processor;

selecting one PSA in the VN group as the target PSA;

16. The SMF of claim 15 wherein said selecting one PSA of a VN group as a target PSA comprises:

One PSA in the VN group is randomly selected as the target PSA.

17. The SMF of claim 15 wherein said processor is further configured to read a computer program in said memory and to:

18. The SMF of claim 15 wherein said processor is further configured to read a computer program in said memory and to:

19. The SMF of claim 15 wherein said processor is further configured to read a computer program in said memory and to:

and sending the matching forwarding rule information to the target PSA.

20. The SMF of claim 19 wherein, in the event that all PSAs in said VN group are on a mobile entity, said matching forwarding rule information includes one or more of the following rules:

21. The SMF of claim 19 wherein, in the event that all PSAs in said VN group are on the surface, said match forwarding rule information includes one or more of the following rules:

22. A target PSA comprising a memory, a transceiver, and a processor;

23. The target PSA of claim 22 wherein the processor is further configured to read a computer program in the memory and perform the following:

24. The target PSA of claim 22 wherein the processor is further configured to read a computer program in the memory and perform the following:

25. The target PSA of claim 24, wherein, in the case where all PSAs in the VN group are on a mobile entity, the matching forwarding rule information includes one or more of the following rules:

26. The target PSA of claim 25, wherein the processor is further configured to read the computer program in the memory and perform the following:

receiving data sent by a DN server;

27. The target PSA of claim 24, wherein in the event that all PSAs in the VN group are on the surface, the match forwarding rule information includes one or more of the following rules:

28. The target PSA of claim 27 wherein the processor is further configured to read a computer program in the memory and perform the following:

Receiving data sent by a DN server;

and forwarding the received data to the corresponding S-UPF.

29. An information transmission apparatus, comprising:

a first selection module for selecting one PSA in the VN group as a target PSA;

30. An information transmission apparatus, comprising:

the first receiving module is used for receiving a first message sent by the SMF, wherein the first message contains information for indicating the target PSA to perform signaling interaction with the DN server; the first message is sent after the SMF selects the target PSA from a plurality of PSAs in a VN group.

31. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for causing a computer to execute the information transmission method according to any one of claims 1 to 14.